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Flowserve MX/QX Profibus DP/PA Field Unit Manual de usuario Pagina 67

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PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
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Channel 353 – Read Discrete Output (Index 113)
This channel, DI_READ_DISC_OUTPUT_CHAN, allows the network user to monitor the state of two
latching relays, S 1-2. These relays control external equipment, and the feedback inputs are available
to other function blocks. The latching relays are configurable to be set when certain events happen,
as discussed in Section 4.9, Status and Alarm Contacts in the MX Installation & Operation Manual,
LMENIM2306, or QX Installation and Operation Manual, LMENIM3306. The relays can be configured
to trip, for example, when the valve reaches the OPEN and CLOSED positions. This channel is
formatted in bit string format such that each bit represents the readback of a single discrete output.
The configuration may be changed to Network Controlled, in which case the network user can change
the state of the contacts over the network using Channel 356.
Channel 353
DI_READ_USER_OUTPUT_CHAN Terminal # Function Value
Discrete Output Number 1 44, 45 State of S1a Bit 0
Discrete Output Number 2 46, 47 State of S2a Bit 1
Discrete Output Number 3 48, 49 State of S1b Bit 2
Discrete Output Number 4 50, 51 State of S2b Bit 3
Channel 354 – Position (Index 114)
This channel, DO_POSITION_CHAN, provides three outputs to the actuator to either Stop, Open, or
Close. It also provides three status readback values from the actuator, indicating:
• The actuator has stopped.
• The actuator is opening or opened.
• The actuator is closing or closed.
Discrete Output function block, DO_POSITION_CHAN, will only function when the actuator has been
locally configured to be in Open/Close mode, as can be selected in the setup menus documented
in the MX Installation & Operation Manual, LMENIM2306, or QX Installation and Operation Manual,
LMENIM3306.
Channel 354
DO_POSITION_CHAN Value
Valid values to write to this block
Stop 0x00
Open 0x01
Close 0x02
Readback on the DO_POSITION_CHAN
Stop 0x00
Opening / Opened 0x01
Closing / Closed 0x02
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